1 /* 2 * Copyright (C) 2015-2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef ANDROID_WORKER_H_ 18 #define ANDROID_WORKER_H_ 19 20 #include <stdint.h> 21 #include <stdlib.h> 22 #include <string> 23 24 #include <condition_variable> 25 #include <mutex> 26 #include <thread> 27 28 namespace android { 29 30 class Worker { 31 public: 32 void Lock() { 33 mutex_.lock(); 34 } 35 void Unlock() { 36 mutex_.unlock(); 37 } 38 39 void Signal() { 40 cond_.notify_all(); 41 } 42 void Exit(); 43 44 bool initialized() const { 45 return initialized_; 46 } 47 48 protected: 49 Worker(const char *name, int priority); 50 virtual ~Worker(); 51 52 int InitWorker(); 53 virtual void Routine() = 0; 54 55 /* 56 * Must be called with the lock acquired. max_nanoseconds may be negative to 57 * indicate infinite timeout, otherwise it indicates the maximum time span to 58 * wait for a signal before returning. 59 * Returns -EINTR if interrupted by exit request, or -ETIMEDOUT if timed out 60 */ 61 int WaitForSignalOrExitLocked(int64_t max_nanoseconds = -1); 62 63 bool should_exit() const { 64 return exit_; 65 } 66 67 std::mutex mutex_; 68 std::condition_variable cond_; 69 70 private: 71 void InternalRoutine(); 72 73 std::string name_; 74 int priority_; 75 76 std::unique_ptr<std::thread> thread_; 77 bool exit_; 78 bool initialized_; 79 }; 80 } 81 #endif 82
